// 组件
import d2ContainerFull from "./components/d2-container-full.vue";
import d2ContainerFullBs from "./components/d2-container-full-bs.vue";
import d2ContainerGhost from "./components/d2-container-ghost.vue";
import d2ContainerGhostBs from "./components/d2-container-ghost-bs.vue";
import d2ContainerCard from "./components/d2-container-card.vue";
import d2ContainerCardBs from "./components/d2-container-card-bs.vue";
import d2Source from "./components/d2-source.vue";

export default {
  name: "d2-container",
  props: {
    // 容器样式
    type: {
      type: String,
      required: false,
      default: "full"
    },
    // 滚动优化
    betterScroll: {
      type: Boolean,
      required: false,
      default: false
    }
  },
  computed: {
    // 始终返回渲染组件
    component() {
      if (this.type === "card" && !this.betterScroll) return d2ContainerCard;
      if (this.type === "card" && this.betterScroll) return d2ContainerCardBs;
      if (this.type === "ghost" && !this.betterScroll) return d2ContainerGhost;
      if (this.type === "ghost" && this.betterScroll) return d2ContainerGhostBs;
      if (this.type === "full" && !this.betterScroll) return d2ContainerFull;
      if (this.type === "full" && this.betterScroll) return d2ContainerFullBs;
      else {
        return "div";
      }
    }
  },
  render(h) {
    const slots = [
      this.$slots.default,
      this.$slots.header ? (
        <template slot="header">{this.$slots.header}</template>
      ) : null,
      this.$slots.footer ? (
        <template slot="footer">{this.$slots.footer}</template>
      ) : null
    ];
    return (
      <div ref="container" class="container-component">
        <this.component
          ref="component"
          {...{ attrs: this.$attrs }}
          onScroll={e => this.$emit("scroll", e)}
        >
          {slots}
        </this.component>
        <d2Source />
      </div>
    );
  },
  methods: {
    // 返回顶部
    scrollToTop() {
      this.$refs.component.scrollToTop();
      // 如果开启了 better scroll 还需要手动触发一遍 scroll 事件
      const bs = this.$refs.component.BS;
      if (bs) this.$refs.component.scroll();
    },
    // 用法同原生方法 scrollBy
    scrollBy(x = 0, y = 0, time = 300) {
      if (this.betterScroll) {
        const bs = this.$refs.component.BS;
        if (bs) {
          bs.scrollBy(-x, -y, time);
          // 手动触发一遍 scroll 事件
          this.$refs.component.scroll();
        }
      } else {
        this.$refs.component.$refs.body.scrollBy(x, y);
      }
    },
    // 用法同原生方法 scrollTo
    scrollTo(x = 0, y = 0, time = 300) {
      if (this.betterScroll) {
        const bs = this.$refs.component.BS;
        if (bs) {
          bs.scrollTo(-x, -y, time);
          // 手动触发一遍 scroll 事件
          this.$refs.component.scroll();
        }
      } else {
        this.$refs.component.$refs.body.scrollTo(x, y);
      }
    },
    // 用法同原生方法 scrollTop
    scrollTop(top = 0, time = 300) {
      if (this.betterScroll) {
        const bs = this.$refs.component.BS;
        if (bs) {
          bs.scrollTo(bs.x, -top, time);
          // 手动触发一遍 scroll 事件
          this.$refs.component.scroll();
        }
      } else {
        this.$refs.component.$refs.body.scrollTop = top;
      }
    }
  }
};
